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If the width of a rectangle is increased by 25% while the length remains constant, the resulting area is what percent of the original area?

(A) 25%

(B) 75%

(C) 125%

(D) 225%

(E) 250%

As there are no exact numbers in the question, why not pick some?This is an Alternative approach.

Say the width is 4 (a number it is easy to increase by 25%) and the length is 1 (a very small number, easy to work with).Then the width increased by to 5 and the new area is 5*1 = 5.So the answer is 5/4 = 125%.